A filter cartridge for use in filtering fluids, for example fuel, lubrication, hydraulic and other liquids, as well as air. The ink-jet recording head includes an individual electrode having an individual electrode main body formed at a position corresponding to an ink chamber and an individual electrode lead-out part for supplying power, a piezoelectric element formed to contact the individual electrode, and a diaphragm formed to contact the piezoelectric element. The connection portion hangs on the lateral cover so as to hang the main body on the lateral cover, and a cup can be disposed inside the main body of the cup holder assembly.